The best of bodybuilders have insane genetics. The rest are amazing responders to AAS. I am naturally a big guy and I’m on 125 mg and look like I do I my pic. I have taken up to almost a gram of test and didn’t change much. I saw maybe a 5-10 lb increase. I do not have good genetics for bodybuilding, but still better than 90% of the male population. Other guys look like they never lifted without steroids but blow up on moderate doses (Kevin Levrone comes to mind).

A solid diet and workout plan is the basis of bodybuilding, but it doesn’t matter if the genetics are not there. AAS, insulin, growth hormone, peptides, ancillaries, diuretics, T3, clen, SEOs, etc., are all a part of this sport. Better genetics allow for less abuse of drugs, but at a competitive level, it’s a big science project.